Tiny plastic figures of Barack Obama and Gordon Brown relieving themselves in public have become online bestsellers.

They are among a host of politicians, sports stars and celebrities to be given the dubious honour of being turned into a 'caganer'.

Catalonians traditionally celebrate Christmas by placing a caganer, which translates as pooper, in a nativity scene.

People find it fun to try to spot the tiny defecating figures which are supposed to bring prosperity and a good harvest.

Traditionally, caganers would be small bearded men in full Catalan costume but these days, it's more likely to be a celebrity. Last year, Barcelona footballer Thierry Henry was the most popular figure sold.